[Chimera-users] Chimera-X

Hi, I am trying to use Chimera-X t for solvent-accessible-surface display (in my system surface display fails almost every time in Chimera). I managed to get it to work in Chimer-X once but now when I click the appropriate icon on the top in chimera-X menu this icon and most others (except the one to open files) are inactive. Is there anything that I should do to activate these icons? I am I missing something? I tried selecting the model that was opened but that didn't help. Thanks.